Move in-page script to `tracker.js` (#73) #51

Job	Run time
Python 3.8 py	18m 13s
JavaScript	28s
Python 3.9 py	19m 3s
Python 3.10 py	19m 2s
Python 3.11 py	13m 37s
Python 3.12 py	4m 8s
Python 3.12 flake8	52s
Python 3.12 wagtailmain-sqlite	1m 31s
Python 3.12 wagtailmain-postgres	1m 43s
	1h 18m 37s

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